An effect of imperfection in node location estimation on distributed beamforming

Distributed beamforming technique has been introduced in the wireless sensor network (WANs) in order to increase the transmission range and signal strength of sensor node. The identical data is transmitted to the destination by all nodes which have timing and carrier synchronously. Then, the data transmissions are combined gainfully at the destination. Thus accuracy of reference signal for synchronization is extremely significant. Synchronization among nodes can achieve by utilizing the reference signals from Global Position System (GPS). This paper investigates into the effect of inaccuracy of the reference signals from GPS in term of node location (radii and phase of each node) on the beamforming performance. The simulation results show that a slightly imperfection of estimated node location can tremendously affect to the beamforming performance.